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             AUSCERT External Security Bulletin Redistribution

          Web Gateway update fixes a Reflected XSS vulnerability
                         (CVE-2019-3638) (SB10294)
                             12 September 2019


        AusCERT Security Bulletin Summary

Product:           McAfee Web Gateway
Publisher:         McAfee
Operating System:  Windows
                   Linux variants
                   OS X
Impact/Access:     Cross-site Scripting -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-3638  

Original Bulletin: 

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McAfee Security Bulletin - Web Gateway update fixes a Reflected XSS
vulnerability (CVE-2019-3638)

Security Bulletins ID   : SB10294

Last Modified           : 9/10/2019


First Published: September 10, 2019
|Impact of          |CWE-79: Improper Neutralization of Input During Web Page |
|Vulnerability:     |Generation ('Cross-site Scripting')                      |
|CVE ID:            |CVE-2019-3638                                            |
|Severity Rating:   |High                                                     |
|CVSS v3 Base/      |8.1 / 7.3                                                |
|Temporal Scores:   |                                                         |
|                   |Install or update to McAfee Web Gateway (MWG)   |
|Recommendations:   |(main release)                                           |
|                   |Install or update to MWG 8.2 (controlled release)        |
|Security Bulletin  |None                                                     |
|Replacement:       |                                                         |
|Affected Software: |MWG 7.8.2 earlier than MWG                      |
|                   |MWG 8.x earlier than MWG 8.2                             |
|Location of updated|https://contentsecurity.mcafee.com /                     |
|software:          |                                                         |

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Article contents:

  o Vulnerability Description
  o Remediation
  o Acknowledgments
  o Frequently Asked Questions (FAQs)
  o Resources
  o Disclaimer

Vulnerability Description
This Security Bulletin addresses one vulnerability in MWG.

Reflected Cross Site Scripting vulnerability in Administrators web console in
McAfee Web Gateway (MWG) 7.8.x earlier than allows remote attackers to
collect sensitive information or execute commands with the MWG administrator's
credentials via tricking the administrator to click on a carefully constructed
malicious link.
To remediate this issue, go to the Product Downloads site, and download the
applicable product update file:
|Product|Version   |Type      |File Name                           |Release   |
|       |          |          |                                    |Date      |
|MWG    |  |Main      |mwgappl-|September |
|       |and later |Release   |                                    |10, 2019  |
|MWG    |8.2       |Controlled|mwgappl-8.2.0-29996.x.86_64.iso     |September |
|       |          |Release   |                                    |10, 2019  |

Download and Installation Instructions
All documentation and software relating to this and other MWG releases can be
found on https://contentsecurity.mcafee.com/ .
McAfee credits Erik Roos for reporting this vulnerability.
Frequently Asked Questions (FAQs)
How do I know if my McAfee product is vulnerable or not
Use the following instructions for MWG:

 1. Open the Administrator's User Interface (UI).
 2. Log on. The product version number displays. If the product version number
    displayed is earlier than the versions specified in the Remediation table,
    it is vulnerable.

What is CVSS
CVSS, or Common Vulnerability Scoring System, is the result of the National
Infrastructure Advisory Council's effort to standardize a system of assessing
the criticality of a vulnerability. This system offers an unbiased criticality
score between 0 and 10 that customers can use to judge how critical a
vulnerability is and plan accordingly. For more information, visit the CVSS
website at: http://www.first.org/cvss/ .

When calculating CVSS scores, McAfee has adopted a philosophy that fosters
consistency and repeatability. Our guiding principle for CVSS scoring is to
score the exploit under consideration by itself. We consider only the immediate
and direct impact of the exploit under consideration. We do not factor into a
score any potential follow-on exploits that might be made possible by the
successful exploitation of the issue being scored.

What are the CVSS scoring metrics

CVE-2019-3638: MWG UI: Reflected Cross-Site Scripting Vulnerability
|Base Score              |8.1                 |
|Attack Vector (AV)      |Network (N)         |
|Attack Complexity (AC)  |Low (L)             |
|Privileges Required (PR)|None (N)            |
|User Interaction (UI)   |Required (R)        |
|Scope (S)               |Unchanged (U)       |
|Confidentiality (C)     |High (H)            |
|Integrity (I)           |High (H)            |
|Availability (A)        |None (N)            |
|Temporal Score (Overall)|7.3                 |
|Exploitability (E)      |Proof of Concept (P)|
|Remediation Level (RL)  |Official Fix (O)    |
|Report Confidence (RC)  |Confirmed (C)       |

NOTE: The below CVSS version 3.0 vector was used to generate this score.

Where can I find a list of all Security Bulletins
All Security Bulletins are published on our external PSIRT website at http://
www.mcafee.com/us/threat-center/product-security-bulletins.aspx > Security
Bulletins. Security Bulletins are retired (removed) once a product is both End
of Sale and End of Support (End of Life).

How do I report a product vulnerability to McAfee
If you have information about a security issue or vulnerability with a McAfee
product, visit the McAfee PSIRT website for instructions at http://
www.mcafee.com/us/threat-center/product-security-bulletins.aspx > Report a
Security Vulnerability.

How does McAfee respond to this and any other reported security flaws
Our key priority is the security of our customers. If a vulnerability is found
within any McAfee software or services, we work closely with the relevant
security software development team to ensure the rapid and effective
development of a fix and communication plan.

McAfee only publishes Security Bulletins if they include something actionable
such as a workaround, mitigation, version update, or hotfix. Otherwise, we
would simply be informing the hacker community that our products are a target,
putting our customers at greater risk. For products that are updated
automatically, a non-actionable Security Bulletin might be published to
acknowledge the discoverer.

View our PSIRT policy on the McAfee PSIRT website at http://www.mcafee.com/us/
threat-center/product-security-bulletins.aspx > About PSIRT.
To contact Technical Support, log on to the ServicePortal and go to the Create
a Service Request page at https://support.mcafee.com/ServicePortal/faces/
serviceRequests/createSR :

  o If you are a registered user, type your User ID and Password, and then
    click Log In .
  o If you are not a registered user, click Register and complete the required
    fields. Your password and logon instructions will be emailed to you.

The information provided in this Security Bulletin is provided as is without
warranty of any kind. McAfee disclaims all warranties, either express or
implied, including the warranties of merchantability and fitness for a
particular purpose. In no event shall McAfee or its suppliers be liable for any
damages whatsoever including direct, indirect, incidental, consequential, loss
of business profits or special damages, even if McAfee or its suppliers have
been advised of the possibility of such damages. Some states do not allow the
exclusion or limitation of liability for consequential or incidental damages so
the preceding limitation may not apply.

Any future product release dates mentioned in this Security Bulletin are
intended to outline our general product direction, and they should not be
relied on in making a purchasing decision. The product release dates are for
information purposes only, and may not be incorporated into any contract. The
product release dates are not a commitment, promise, or legal obligation to
deliver any material, code, or functionality. The development, release, and
timing of any features or functionality described for our products remains at
our sole discretion and may be changed or canceled at any time

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